chr8-11845178-A-C

Position:

• chr8-11845178-A-C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_001908.5(CTSB):​c.967T>G​(p.Ser323Ala) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: CTSB NM_001908.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.70

Genes affected

CTSB (HGNC:2527): (cathepsin B) This gene encodes a member of the C1 family of peptidases. Alternative splicing of this gene results in multiple transcript variants. At least one of these variants encodes a preproprotein that is proteolytically processed to generate multiple protein products. These products include the cathepsin B light and heavy chains, which can dimerize to form the double chain form of the enzyme. This enzyme is a lysosomal cysteine protease with both endopeptidase and exopeptidase activity that may play a role in protein turnover. It is also known as amyloid precursor protein secretase and is involved in the proteolytic processing of amyloid precursor protein (APP). Incomplete proteolytic processing of APP has been suggested to be a causative factor in Alzheimer's disease, the most common cause of dementia. Overexpression of the encoded protein has been associated with esophageal adenocarcinoma and other tumors. Both Cathepsin B and Cathepsin L are involved in the cleavage of the spike protein from the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) upon its entry to the human host cell. Multiple pseudogenes of this gene have been identified. [provided by RefSeq, Sep 2020]

CTSB (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.76

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CTSB	NM_001908.5	c.967T>G	p.Ser323Ala	missense_variant	10/10	ENST00000353047.11	NP_001899.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CTSB	ENST00000353047.11	c.967T>G	p.Ser323Ala	missense_variant	10/10	1	NM_001908.5	ENSP00000345672.5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 17, 2021

The c.967T>G (p.S323A) alteration is located in exon 10 (coding exon 9) of the CTSB gene. This alteration results from a T to G substitution at nucleotide position 967, causing the serine (S) at amino acid position 323 to be replaced by an alanine (A). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.16
BayesDel_addAF	Pathogenic	0.25	D
BayesDel_noAF	Uncertain	0.11
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.76	D;D;D;D;D;D;D
Eigen	Uncertain	0.23
Eigen_PC	Uncertain	0.31
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.94	.;.;.;.;.;.;D
M_CAP	Benign	0.066	D
MetaRNN	Pathogenic	0.76	D;D;D;D;D;D;D
MetaSVM	Uncertain	0.28	D
MutationAssessor	Uncertain	2.2	M;M;M;M;M;M;M
PrimateAI	Uncertain	0.52	T
PROVEAN	Uncertain	-2.5	N;N;N;N;N;N;N
REVEL	Uncertain	0.61
Sift	Benign	0.030	D;D;D;D;D;D;D
Sift4G	Benign	0.095	T;T;T;T;T;T;T
Polyphen		0.32	B;B;B;B;B;B;B
Vest4		0.61
MutPred		0.69		Loss of catalytic residue at S323 (P = 0.0376);Loss of catalytic residue at S323 (P = 0.0376);Loss of catalytic residue at S323 (P = 0.0376);Loss of catalytic residue at S323 (P = 0.0376);Loss of catalytic residue at S323 (P = 0.0376);Loss of catalytic residue at S323 (P = 0.0376);Loss of catalytic residue at S323 (P = 0.0376);
MVP		0.90
ClinPred		0.94	D
GERP RS		6.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.65
gMVP		0.78

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1813033223; hg19: chr8-11702687;